File folder with expandable pocket

Abstract

A one-piece file folder for use in vertical, lateral, rotary and similar files having an improved expandable pocket with a locking tab that is slidable in accordance with the amount of papers disposed within the pocket.

What is claimed is: 
     
       1. In a file folder formed from a single flat sheet having a front leaf, a back leaf, a side leaf and a bottom leaf extending from said back leaf in which a pocket for containing filing material is formed by the back, side and bottom leaves and in which upper edges of said front, back, side and bottom leaves are open and exposed for permitting ready insertion and withdrawal of papers, the improvement which comprises slidable means including a T shaped tab on said bottom leaf, said bottom leaf being folded over said back leaf, and guiding means having spaced slits for said sliding means on said side leaf for adjustably arranging said pocket, said side leaf being folded over said bottom leaf and also over said back leaf, said T shaped tab being folded over a side edge of said side leaf for mesh engagement of said tab with said slits whereby, when said tab and slits are interconnected, said pocket can be expanded or contracted as filing material is added to or removed from said pocket. 
     
     
       2. In the file folder of claim 1, wherein said T shaped tab includes an elongated neck, portion extending from a side of said bottom leaf and a pair of protuberances extending from said neck portion, said protuberances being at right angles to said neck portion. 
     
     
       3. In the file folder of claim 2, wherein said neck portion extends from the side of said bottom leaf at an acute angle and is adapted to overlay said side leaf. 
     
     
       4. In the file folder of claim 3, wherein said bottom leaf side is in substantial alignment with a side of said side leaf. 
     
     
       5. In the file folder of claim 4, wherein said spaced slits are substantially parallel with side edges of said neck portion when laid over said side leaf. 
     
     
       6. In the file folder of claim 5, wherein each of said protuberances of said tab is slidably disposed in said slits with said tab overlaying said side leaf. 
     
     
       7. In the file folder of claim 6, wherein said bottom leaf and said side leaf include a plurality of score lines for enabling said pocket to expand while said protuberances are slidably engageable in said slits. 
     
     
       8. In the file folder of claim 1, wherein a rigid triangular spine is formed at the juncture of said front leaf and back leaf. 
     
     
       9. In the file folder of claim 8, wherein a tubular element is disposed in said triangular spine for reinforcing said spine.